What causes my subaru to idle to slow?

A slow idle in your Subaru can be caused by several factors, including a dirty or malfunctioning idle air control valve, vacuum leaks in the intake system, or issues with the fuel system, such as clogged fuel injectors or a failing fuel pump. Additionally, problems with the ignition system, like worn spark plugs or ignition coils, can affect engine performance and idle speed. Regular maintenance and diagnostics can help identify and resolve these issues.